Under armour unstoppable singlet vest mens the under armour unstoppable singlet vest has been constructed with heatgear technology that wicks sweat away from your body while running pulling it to the surface of the vest and speeding up evaporation this keeps your body cool dry and light so you can keep on working out the vest features a sleeveless design with a scoop neck and mesh panels the graphic design to the front of the vest finishes off the look and the under armour logo offers inst